Single utility function to return array from tensor/image

[sarthakpati]

Fixes #N.A.

Proposed Changes

• added a helper function to return numpy array from torch.Tensor or sitk.Image
• reduces amount of code

Checklist

• I have read the CONTRIBUTING guide
• My PR is based from the current GaNDLF master
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change
• Function/class source code documentation added/updated
• Code has been blacked for style consistency
• If applicable, version information has been updated in GANDLF/version.py
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file
• Usage documentation has been updated, if appropriate
• History has been updated, if appropriate
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3,4]

[codecov]

Codecov Report

Merging #483 (2f12dd3) into master (5030ff8) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #483      +/-   ##
==========================================
+ Coverage   92.42%   92.46%   +0.03%     
==========================================
  Files         105      105              
  Lines        6433     6451      +18     
==========================================
+ Hits         5946     5965      +19     
+ Misses        487      486       -1     

Flag	Coverage Δ
unittests	92.46% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
GANDLF/utils/__init__.py	100.00% <ø> (ø)
GANDLF/data/post_process/morphology.py	96.15% <100.00%> (-0.52%)	⬇️
GANDLF/utils/generic.py	92.53% <100.00%> (+1.30%)	⬆️
GANDLF/utils/tensor.py	88.27% <100.00%> (-0.08%)	⬇️
testing/test_full.py	98.05% <100.00%> (+0.02%)	⬆️
...NDLF/data/preprocessing/template_matching/utils.py	97.67% <0.00%> (+2.32%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.